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United States Patent | 5,574,334 |
Robol | November 12, 1996 |
A conductive sleeve is located around each of the filament supports of an incandescent lamp enclosed in a glass bulb. The sleeve is spaced from the support by an insulating spacer. The sleeve is connected to a ground so that if the bulb breaks liquid flowing into the bulb creates a conducting path between the filament supports and the ground. The sleeve has a generally hollow, cylindrical shape spaced and is positioned around the support.
Inventors: | Robol; Ronald B. (Sanford, NC) |
Assignee: | Essef Corporation (Chardon, OH) |
Appl. No.: | 402911 |
Filed: | March 13, 1995 |
Current U.S. Class: | 313/578; 313/590; 362/101; 362/267 |
Intern'l Class: | H01J 017/00; H01J 061/00; F21V 033/00; F21V 029/00 |
Field of Search: | 313/331,332,333,578,590,605,626 315/74,75,119,125 362/101,267 |
1901703 | Apr., 1931 | Crowley. | |
4544996 | Oct., 1985 | George. |
U.S. application Serial No. 08/119,617, filed Sep. 13, 1993, for "Self Grounding Lamp". |